Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 0f600462b8cc5dc8…

MALICIOUS

Office (OLE) / .XLS

484.5 KB Created: 2010-05-25 11:09:35 Authoring application: Microsoft Excel
MD5: 856a596abaa248a60c6441f03f0cac6a SHA-1: 4d504b740c9e398596688df5a8d4eade38a4adff SHA-256: 0f600462b8cc5dc8274fe3fb9f5da74d4cca6a88a231a6a47674172cd67222bd
190 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is an Excel file containing a Workbook_Open VBA macro. This macro is designed to delete all worksheets except 'Pohjat', indicating an attempt to manipulate the document's content. The presence of CreateObject and ShellExecute API references suggests the macro is capable of executing arbitrary code or downloading additional payloads. The macro's intent is to modify the workbook structure, likely as a precursor to a malicious action.

Heuristics 7

  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.exceltip.com/st/Copy_modules_from_one_workbook_to_another_using_VBA_in_Microsoft_Excel/501.html
    • http://www.excelguru.ca/node/21#MultiSingle
    • http://sourceforge.net/projects/pdfcreator/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
f33448db2ff71ceb5f1b04a5189a030e01ffd4393e603ad86269e646440a1e06		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 163397 bytes

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